<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        .item-a {
            grid-area: header;
        }
        .item-b {
            grid-area: main;
        }
        .item-c {
            grid-area: sidebar;
        }
        .item-d {
            grid-area: footer;
        }

        .container {
            width: 100%;
            height: 200px;
            display: grid;
            grid-template-columns: 150px 150px 150px 150px;
            grid-template-rows: auto;
            grid-gap: 10px;
            grid-template-areas:
                    "header header header header"
                    "main main . sidebar"
                    "footer footer footer footer";
        }
        .container>div{
            background: #3bbced;
            color: #fff;
        }
        .one{
            grid-column: span 4;
            background: blue;
        }
    </style>
</head>
<body>
    <div class="container">
        <div class="item-a">
            head
            head
        </div>
        <div class="item-b">
            main
        </div>
        <div class="item-c">
            sidebar
        </div>
        <div class="item-d">
            footer
        </div>
    </div>
<div>
    xiamian
</div>
</body>
</html>